Because of the way I process new books I use the option to copy from one library to another. I updated to 8.70 this morning and found later that this option is no longer in the right-click option menu. For that matter, I can't find anywhere else either. I went through preferences and failed to find anything that might add this option again. A search of this forum failed to show any post relating to this. In addition, I also lost references to plugins in the toolbar and the right-click menu. I am able to rectify this problem by a reinstall. But nothing for the copy option. I am using Lubuntu 12.04. Any ideas of how to add this option?

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You lost your Calibre Configuration directory? That is where PI, the Library list and Last used are stored.
Did you use a different User Logon?